B737-300 crew had altitude overshoot in S46 class B airspace.

Attributes
ACN	491820
Time
Date	200011
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : sea.vortac
State Reference	WA
Altitude	msl bound lower : 9000 msl bound upper : 9100
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s46.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Route In Use	departure sid : summa 5
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : s46.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 8500
ASRS Report	491820
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure non adherence : company policies non adherence : clearance
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued alert controller : issued advisory controller : provided flight assist flight crew : returned to assigned altitude none taken : insufficient time
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I had a 'green' copilot who was hand flying the aircraft on the summa 5 departure. ATC was busy with numerous traffic pointout. We were climbing to 9000 ft. At 8700 ft after taking a traffic pointout from departure control, I reminded the copilot to leveloff at 9000 ft, since we were climbing at 2500 FPM and he was looking out the right window. We made a square leveloff but for passenger comfort he let the plane drift up to 9100 ft. Departure control inquired about our altitude, apparently his altitude readout read 9200 ft. We did get a momentary TA. Conclusion: don't fly with a 'green' copilot with an altitude encoder that is out of calibration by 100 ft.

Original NASA ASRS Text

Title: B737-300 CREW HAD ALT OVERSHOOT IN S46 CLASS B AIRSPACE.

Narrative: I HAD A 'GREEN' COPLT WHO WAS HAND FLYING THE ACFT ON THE SUMMA 5 DEP. ATC WAS BUSY WITH NUMEROUS TFC POINTOUT. WE WERE CLBING TO 9000 FT. AT 8700 FT AFTER TAKING A TFC POINTOUT FROM DEP CTL, I REMINDED THE COPLT TO LEVELOFF AT 9000 FT, SINCE WE WERE CLBING AT 2500 FPM AND HE WAS LOOKING OUT THE R WINDOW. WE MADE A SQUARE LEVELOFF BUT FOR PAX COMFORT HE LET THE PLANE DRIFT UP TO 9100 FT. DEP CTL INQUIRED ABOUT OUR ALT, APPARENTLY HIS ALT READOUT READ 9200 FT. WE DID GET A MOMENTARY TA. CONCLUSION: DON'T FLY WITH A 'GREEN' COPLT WITH AN ALT ENCODER THAT IS OUT OF CALIBRATION BY 100 FT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.